单项选择题

The canal was built with the help of （）

A．the airplane
B．the automobile
C．both the plane and the automobile
D．neither the plane nor the automobile

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单项选择题

A．the beginnings of oceanography
B．the laying of the first undersea cable
C．the investigation of ocean depths
D．the early intercontinental communications

单项选择题

In scope and difficulty, the canals construction was most closely alike to that of the （）

A．Suez Canal
B．trans-Siberian Railroad
C．Taj Mahal
D．pyramids of Egypt